Water Pressure Puzzel - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 12 Old 05-31-2010 Thread Starter
Member
 
cvsheppard's Avatar
 
Join Date: Jun 2007
Location: Portland, Or.
Posts: 64
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 8
 
Water Pressure Puzzel

I'm assuming (I know what they say about that) that I have a fresh water pressure leak because my pump keeps cycling every few minutes. I replaced 90% of my fresh water hose last summer and rechecked all the connections - no leaks found. I can't find any water leaks anywhere, I've doubled checked this. I removed the accumulator tank from the system and still have pump cycling. I've inspected the pump with no type of leaks detected. This all started after I put new faucet washers in the head. I did shut off the water and for this repair but afterwards I reprimed the lines with no problem and the water runs fine with no air spurting out. Another curious thing is that everytime the pump cycles, the manual pump faucets spit out a little water. Now this was happening berfore the constant pump cycling so I don't thing it's the problem, but is that common? I don't know what else to check.

Carl

s/v Credence II
PSC 34 #159
Portland, Or
cvsheppard is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 12 Old 05-31-2010
Senior Member
 
Join Date: Jul 2008
Location: chesapeake bay
Posts: 1,942
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
put the accumulator back in it will help with the cycling, ie it wont happen as often. as for the cycling it does not take much leakage back thru the pump to make it cycle again. with out a accumulator it can cycle if as little as a 1/8 cup or so leaks back, as soon as the pressure drops it will run again and with no accumulator only the hoses swelling under pressure keep the pressure up. if it bugs you that much a check valve between the tank and pump will help. i turn my pump off if i wont be using water in the next hour
scottyt is offline  
Quote Quick Reply Share with Facebook
post #3 of 12 Old 05-31-2010
Seņor Member
 
PorFin's Avatar
 
Join Date: Sep 2007
Posts: 1,444
Thanks: 8
Thanked 18 Times in 18 Posts
Rep Power: 8
 
Quote:
Originally Posted by cvsheppard View Post
I'm assuming (I know what they say about that) that I have a fresh water pressure leak because my pump keeps cycling every few minutes. I replaced 90% of my fresh water hose last summer and rechecked all the connections - no leaks found. I can't find any water leaks anywhere, I've doubled checked this. I removed the accumulator tank from the system and still have pump cycling. I've inspected the pump with no type of leaks detected. This all started after I put new faucet washers in the head. I did shut off the water and for this repair but afterwards I reprimed the lines with no problem and the water runs fine with no air spurting out. Another curious thing is that everytime the pump cycles, the manual pump faucets spit out a little water. Now this was happening berfore the constant pump cycling so I don't thing it's the problem, but is that common? I don't know what else to check.
Carl,

Try reinstalling the accumulator tank. Its purpose is to prevent the constant cycling that you are describing. The pressure bladder in the tank will maintain constant pressure against the switch for a much longer period than your water lines will.

There is likely a leak somewhere in your system. If you aren't discovering water outside of the system, it could be internal to the pump.
PorFin is offline  
Quote Quick Reply Share with Facebook
post #4 of 12 Old 05-31-2010
Courtney the Dancer
 
jrd22's Avatar
 
Join Date: Nov 2000
Location: San Juan Islands., WA, USA
Posts: 3,883
Thanks: 4
Thanked 22 Times in 21 Posts
Rep Power: 15
 
I would guess that it's bleeding back through the pump. You could check this by disconnecting the hose on the pressure side of the pump and attaching a short length of hose with a plug or a bolt hose clamped in the end. Start the pump and if there are no leaks and it cycles you know it's going back thru the pump. Depending on the type of pump you might be able to rebuild it.

John
SV Laurie Anne

1988 Brewer 40 Pilothouse

jrd22 is offline  
Quote Quick Reply Share with Facebook
post #5 of 12 Old 05-31-2010
Senior Member
 
Join Date: Mar 2008
Posts: 888
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 8
 
I'd add a check valve AFTER the pump in the pressure side, not in the suction. Generally check valves in the suction are a bad idea. Putting it after the pump, and assuming the pump is leaking back, will actually make it easier for the pump to start up.

Gary H. Lucas
GaryHLucas is offline  
Quote Quick Reply Share with Facebook
post #6 of 12 Old 05-31-2010
Senior Member
 
Join Date: Jul 2008
Location: chesapeake bay
Posts: 1,942
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
in some ways gary you are right, the check valve after the pump will let the motor start easier if it leaks down. the problem with this is now you only have a few inches of hose to hold pressure, unless the accumulator is before the valve, but that means it can still leak down
scottyt is offline  
Quote Quick Reply Share with Facebook
post #7 of 12 Old 05-31-2010
Grasshopper
 
JiffyLube's Avatar
 
Join Date: Jan 2008
Location: Oceanside, Ca.
Posts: 896
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
If you have a water heater hooked up, check the WH for leaks. I had one that was leaking through the heating element.
JiffyLube is offline  
Quote Quick Reply Share with Facebook
post #8 of 12 Old 05-31-2010 Thread Starter
Member
 
cvsheppard's Avatar
 
Join Date: Jun 2007
Location: Portland, Or.
Posts: 64
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 8
 
Thanks everyone for you input. Turns out jrd22 was right, it was the pump. Replaced pump and all is right again in the world, for a few minutes. I still get some water discharge from the manual faucet whenever I use the pressure system. Is that normal?

Carl

s/v Credence II
PSC 34 #159
Portland, Or
cvsheppard is offline  
Quote Quick Reply Share with Facebook
post #9 of 12 Old 05-31-2010
Courtney the Dancer
 
jrd22's Avatar
 
Join Date: Nov 2000
Location: San Juan Islands., WA, USA
Posts: 3,883
Thanks: 4
Thanked 22 Times in 21 Posts
Rep Power: 15
 
I don't know if it is "normal" or not, but mine does the same thing - sometimes. Glad you figured out what was going on.

John
SV Laurie Anne

1988 Brewer 40 Pilothouse

jrd22 is offline  
Quote Quick Reply Share with Facebook
post #10 of 12 Old 05-31-2010
Senior Member
 
Join Date: Jul 2008
Location: chesapeake bay
Posts: 1,942
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
yes it is normal, look at it like this.

the manual pump is nothing but 2 check valves, one allows water into the "pump" the other allows it out. ie both valve go the same way tank to the sink, when the pressure changes the valves leak a little. when the pressure stabilizes the valves seal using the spring in them. if the manual pump was new it might not leak, notice i said might

edit

you might want to run a new water line for the manual pump straight to the tank. that way if the 12v pump dies you are not trying to pull water thru the 12 v pump. this will stop the leak, and allow you to just pump a little water manually when needed without turning on the 12 v pump

Last edited by scottyt; 05-31-2010 at 09:58 PM.
scottyt is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Water Cay to Raccoon Cay, Jumentos 4-3-10 skipgundlach Cruising & Liveaboard Forum 0 04-26-2010 11:29 AM
water ballast musolmar Boat Review and Purchase Forum 8 09-26-2004 04:50 PM
Water Ballast/Manufacturer RSJ Boat Review and Purchase Forum 6 03-07-2002 05:59 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome